RapidMiner is great for many things except variable importance! All other major DM tools have it. That way, you can also assess the ranked ordered importance of variables in a predictive model. PLEASE!

Hmmm... yes, there's nothing obvious that I can see. Some Weka operators might have it built in. Otherwise you may need to use something like the R caret package integrated into your RM process. http://www.jstatsoft.org/v28/i05

I am not aware of variable importance on Weka or in R. I think this is what differentiates a professional tool from an experimental one. I cannot understanding the reasoning behind not including Variable Importance in RapidMiner. IT IS UNFORTUNATE!